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Natural Zeolite and Sand Capping Treatment for Interrupting the Release of Cd, Cr, Cu, and Zn from Marine Contaminated Sediment and Stabilizing the Heavy Metals
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 Title & Authors
Natural Zeolite and Sand Capping Treatment for Interrupting the Release of Cd, Cr, Cu, and Zn from Marine Contaminated Sediment and Stabilizing the Heavy Metals
Kang, Ku; Kim, Young-Kee; Park, Seong-Jik;
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 Abstract
We investigated the effectiveness of natural zeolite (NZ) and sand (SD) as a capping material to block the release of heavy metals (Cd, Cr, Cu, and Zn) from heavily contaminated marine sediments and stabilize these heavy metals in the sediments. The efficiency of NZ and SD for blocking trace metals was evaluated in a flat flow tank attached with an impeller to generate wave. 0, 10, 30, and 50 mm depth of NZ or SD were capped on the contaminated marine sediments and the metal concentration in seawater was monitored. After completion of flow tank experiments, sequential extractions of the metals in the sediment below the capping material were performed. The difference of pH, EC, and DO concentration between uncapped and capped condition was not significant. The release of cations including Cd, Cu, and Zn were effectively blocked by NZ and SD capping but the interruption of Cr release was observed only in 50 mm depth of SD capped condition. However, the stabilization of Cr in 50 mm depth of SD capped condition was not achieved when compared to uncapped condition. NZ and SD capping were effective for stabilizing Cd, Cu, and Zn in marine sediments. It is concluded that the use of NZ with SD as a capping material is recommended for blocking Cd, Cr, Cu, and Zn release and stabilizing them in contaminated marine sediments.
 Keywords
In-situ Capping;Natural Zeolite;Sand;Heavy Metals;Marine Sediment;
 Language
Korean
 Cited by
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